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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2941f9c1a9c95f6c8fdf91edf574aa35492a7cc9452138f6d37fb81b0259c0a5' 
  AND token = 'nAm00CaI0rLOmf432m+eU5qDxK93Ery070bGOVr9qb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}